Browsing by Author Nguyen, Van Hieu

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  • 128.pdf.jpg
  • Article


  • Authors: Nguyen, Quang Bau; Nguyen, Van Hieu; Nguyen, Thi Thanh Huyen; Nguyen, Dinh Nam; Tran, Cong Phong (2009)

  • The acoustomagnetoelectric effect in a superlattice is investigated for an acoustic wave whose wavelength is smaller than the mean free path l of the electrons and hypersound in the ragion (where q is the acoustic wave number). All the results are compared with the normal bulk semiconductors (both theory and experiment) in the weak magnetic field region to show the difference.

  • On-chip-growth-of-semiconductor-metal-oxide-nanowires-for-gas-sensors-A-review_2017_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Chu, Manh Hung; Dang, Thi Thanh Le; Nguyen, Van Hieu (2017)

  • A semiconductor metal oxide nanowires (SMO-NWs) shows potential for novel gas sensor applications because of its distinct properties, such as high ratio of surface area to volume, high crystallinity, and perfect pathway forelectron transfer (length of NW). SMO-NW sensors can be configured as resistors or field-effect transistors for gas detection, and different configurations, such as single NW, multiple NWs, and networked NW films, have been established. A surface-functionalizing NWs with catalyst elements and a self-heating NWs provides other options for highly selective andlow-power consumption gas sensors. However, an appropriate design and integration of SMO-NWs should also be ...

  • document(4).pdf.jpg
  • Article


  • Authors: Nguyen, Van Hieu; Nguyen, Van Vinh (2017)

  • An intensive field survey on aquatic insects of Me Linh Station for Biodiversity in Vinhphuc province was conducted in December 2015. Specimens were collected at 8 different sites and aquatic insects were collected both quantitatively by Surber net and qualitatively by hand net, pond net. As a result, a total of 110 aquatic insect species belonging to 98 genera, 49 families and 9 orders were recognized. Among these, the order Ephemeroptera had the highest species number with 26 species, followed by Odonata with 25 species, Trichoptera with 18 species, Coleoptera with 15 species, Hemiptera with 11 species, Diptera with 9 species. Lepidoptera, Plecoptera and Megaloptera had the lowest o...

  • Synthesis-and-gas-sensing-characteristics-of-Fe2O3-hollow-balls_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Nguyen, Duc Hoa; Chu, Manh Hung; Nguyen, Van Toan; Dang, Thi Thanh Le; Nguyen, Van Duy; Nguyen, Van Hieu (2016)

  • The synthesis of porous metal-oxide semiconductors for gas-sensing application is attracting increased interest. In this study, α-Fe2O3 hollow balls were synthesized using an inexpensive, scalable, and template-free hydrothermal method. The gas-sensing characteristics of the semiconductors were sys-tematically investigated. Material characterization by XRD, SEM, HRTEM, and EDS reveals that single-Phase α-Fe2O3 hollow balls with an average diameter of 1.5mm were obtained. The hollow balls were formed by self assembly of α-Fe2O3 nanoparticles with an average diameter of 100 nm. The hollow structure and nanopores between the nanoparticles resulted in the significantly high response of th...

  • document(7).pdf.jpg
  • Article


  • Authors: Nguyen, Van Hieu; Bùi, Thuy Lien; Nguyen, Van Vinh (2016)

  • This study aims to assess the environmental condition of selected water bodies in Ngọc Thanh commune, Phuc Yen district, Vinh Phuc province. Water quality was assessed by using macro-invertebrates as bio-indicators. Field collection from 20 sampling sites in December 2015 has yielded 71 aquatic macro-invertebrates families, 64 of which were included in the BMWPVIET scoring system. Among 20 sampling sites, eleven sites (from site S10 to site S20) were classified at the α-Mesosaprobe level (quite polluted), with ASPT scores ranging from 3.0 to 4.9; two sites (S7 and S8) with ASPT scores 5.5 and 5.7 respectively, were classified at the β-Mesosaprobe (quite polluted); seven sites (from si...

Browsing by Author Nguyen, Van Hieu

Jump to: 0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
or enter first few letters:  
Showing results 1 to 5 of 5
  • 128.pdf.jpg
  • Article


  • Authors: Nguyen, Quang Bau; Nguyen, Van Hieu; Nguyen, Thi Thanh Huyen; Nguyen, Dinh Nam; Tran, Cong Phong (2009)

  • The acoustomagnetoelectric effect in a superlattice is investigated for an acoustic wave whose wavelength is smaller than the mean free path l of the electrons and hypersound in the ragion (where q is the acoustic wave number). All the results are compared with the normal bulk semiconductors (both theory and experiment) in the weak magnetic field region to show the difference.

  • On-chip-growth-of-semiconductor-metal-oxide-nanowires-for-gas-sensors-A-review_2017_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Chu, Manh Hung; Dang, Thi Thanh Le; Nguyen, Van Hieu (2017)

  • A semiconductor metal oxide nanowires (SMO-NWs) shows potential for novel gas sensor applications because of its distinct properties, such as high ratio of surface area to volume, high crystallinity, and perfect pathway forelectron transfer (length of NW). SMO-NW sensors can be configured as resistors or field-effect transistors for gas detection, and different configurations, such as single NW, multiple NWs, and networked NW films, have been established. A surface-functionalizing NWs with catalyst elements and a self-heating NWs provides other options for highly selective andlow-power consumption gas sensors. However, an appropriate design and integration of SMO-NWs should also be ...

  • document(4).pdf.jpg
  • Article


  • Authors: Nguyen, Van Hieu; Nguyen, Van Vinh (2017)

  • An intensive field survey on aquatic insects of Me Linh Station for Biodiversity in Vinhphuc province was conducted in December 2015. Specimens were collected at 8 different sites and aquatic insects were collected both quantitatively by Surber net and qualitatively by hand net, pond net. As a result, a total of 110 aquatic insect species belonging to 98 genera, 49 families and 9 orders were recognized. Among these, the order Ephemeroptera had the highest species number with 26 species, followed by Odonata with 25 species, Trichoptera with 18 species, Coleoptera with 15 species, Hemiptera with 11 species, Diptera with 9 species. Lepidoptera, Plecoptera and Megaloptera had the lowest o...

  • Synthesis-and-gas-sensing-characteristics-of-Fe2O3-hollow-balls_2016_Journal-of-Science-Advanced-Materials-and-Devices.pdf.jpg
  • Article


  • Authors: Nguyen, Duc Hoa; Chu, Manh Hung; Nguyen, Van Toan; Dang, Thi Thanh Le; Nguyen, Van Duy; Nguyen, Van Hieu (2016)

  • The synthesis of porous metal-oxide semiconductors for gas-sensing application is attracting increased interest. In this study, α-Fe2O3 hollow balls were synthesized using an inexpensive, scalable, and template-free hydrothermal method. The gas-sensing characteristics of the semiconductors were sys-tematically investigated. Material characterization by XRD, SEM, HRTEM, and EDS reveals that single-Phase α-Fe2O3 hollow balls with an average diameter of 1.5mm were obtained. The hollow balls were formed by self assembly of α-Fe2O3 nanoparticles with an average diameter of 100 nm. The hollow structure and nanopores between the nanoparticles resulted in the significantly high response of th...

  • document(7).pdf.jpg
  • Article


  • Authors: Nguyen, Van Hieu; Bùi, Thuy Lien; Nguyen, Van Vinh (2016)

  • This study aims to assess the environmental condition of selected water bodies in Ngọc Thanh commune, Phuc Yen district, Vinh Phuc province. Water quality was assessed by using macro-invertebrates as bio-indicators. Field collection from 20 sampling sites in December 2015 has yielded 71 aquatic macro-invertebrates families, 64 of which were included in the BMWPVIET scoring system. Among 20 sampling sites, eleven sites (from site S10 to site S20) were classified at the α-Mesosaprobe level (quite polluted), with ASPT scores ranging from 3.0 to 4.9; two sites (S7 and S8) with ASPT scores 5.5 and 5.7 respectively, were classified at the β-Mesosaprobe (quite polluted); seven sites (from si...